. The Bell System technical journal . busy hour, and approximately 4 per cent NC for the wholeday, producing perhaps a two-minute over-all speed of serA-ice in thebusy season. With the proposed automatic alternate routing plan, all points on thechart will have automatic switching The customer (or theoperator until customer dialing arrangements are completed) will dial aten-digit code (three-digit area code 305 for Florida plus the listedMiami seven-digit telephone number) into the Jiiachine at various routes which then might conceivably be tried automatically * Sec the h

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. The Bell System technical journal . busy hour, and approximately 4 per cent NC for the wholeday, producing perhaps a two-minute over-all speed of serA-ice in thebusy season. With the proposed automatic alternate routing plan, all points on thechart will have automatic switching The customer (or theoperator until customer dialing arrangements are completed) will dial aten-digit code (three-digit area code 305 for Florida plus the listedMiami seven-digit telephone number) into the Jiiachine at various routes which then might conceivably be tried automatically * Sec the hihlio^rajjliy (i);irticulMily Pilliod and Truitt) for details of tliegeneral trunkinji plan. t The notation uscmI on the diagram of Fig. 8 is: Opon firclo — Primary Center(Syracuse, Miamij; Triangle — Sectional Center (All)an\-, Jacksonville); Sqviare— Regional Center (White Plains, Atlanta, St. Louis; St. Louis is also the Na-tional Center). THEORIES FOR TOLL TRAFFIC ENGINEERING IN THE U. S. A. 439 PRESENT OPERATOR ROUTING ^^. AUTOMATIC ALTERNATEROUTING white PlainsN. Y.) Miami

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1